William



(No Model.)

W. G. 'HOMAN. DRAFT TUBE FOR CENTRAL DRAFT LAMPS. No. 494,863.

Patented Apr. 4, 1893.

m: nonms ms 00., mamilmou wxsnmercm, ac.

UNITED STATES PATENT OFFIC YVILLIAM G. HOMAN, OF MERIDEN, CONNECTICUT,ASSIGNOR TO THE EDNARD MILLER 82; COMPANY, OF SAME PLACE.

DRAFT-TUBE FOR CE SPECIFICATION forming part of Letters Patent No.494,863, dated April 4, 1893.

Application filed November 2, 1891- Serial No. 410,594. (No model.)

To aZZ whom it may concern:

Be it known that I, WILLIAM. C. HOMAN, of Meriden, in the county of NewHaven and State of Connecticut, have invented a new Improvement inDraft-Tubes for Central- Draft Lamps; and I do hereby declare thefollowing, when taken in connection with accompanying drawings and theletters of reference marked thereon, to be a full, clear, and exactdescription of the same, and which said drawings constitute part of thisspecification, and represent, in

Figure 1, a view in side elevation of a drafttnbe constructed inaccordance with my invention and located in an ordinary lamp-fount, theupper section of the tube being shown as lifted above the lower sectionthereof. Fig. 2, a view of the tube in vertical section on the line a-bof Fig. 1. Fig. 8, a similar view on the line cd of Fig. 2. Fig. 4, aplan view of the lower tube-section.

My invention relates to an improvement in that class of central-draftlamps which have their draft-tubes constructed to intercept and disposeof any oil which may find its way into their upper ends, whereby thelamps are prevented from weeping as the saying is, and especiallyadapted for the use of air-distributers which are set within the upperends of their draft tubes instead of over the same.

This present invention is an improvement upon an invention described. inan earlier application filed October 19, 1891, and serially numbered409,207. That application set forth the use of oil-pockets produced inthe exterior surface of a draft-tube and opening at their upper endsinto the bottom of a catchflange located within the tube and serving tointercept escaping oil and deflect it at once into the said pockets,which retain it until it is disposed of.

The object of my present invention is to produce at a low cost formanufacture, a drafttube having oil-pockets produced in its exteriorsurface, and a catch-flange formed integral with it.

With these ends in view, my invention consists in a draft-tube for acentral-draft lamp, the said tube being made in two parts or sections ofwhich the lower section is contracted at its upper end to permit theupper section to fit over it, and has its upper edge set inwardly toform a catch-flange, and is constructed with one or more capaciousoil-pockets produced in its exterior surface by forcing the same inward,and leading downward from its said flange, and opening at its or theirupper end or ends thereinto.

As herein shown, my improved sectional draft-tube is composed of alonglower section A, and a short upper section 13, both of the same externaldiameter. The upper end of the lower section is contracted, as at A, toadapt the upper section to fit over it. A shoulder a, formed bycontracting the upper end of the lower section, provides a seat for thelower end of the upper section. The extreme upper edge 0, of the lowersection is set inwardly at an angle to form an inside catch-flange D,for the interception of any oil which may es cape into the uppersection, which forms the upper portion of the tube. The said catchflangeis therefore formed integral with the tube. The oil intercepted by thesaid fiange is conveyed to the outer surface of the tube and disposed ofby means of depressed exterior oil-pockets, consisting of two deepvertical grooves or depressions E E, produced in the exterior of thetube by forcing portions of the surface of the lower section A, of thesame inward, beginning at its inwardly set contracted upper edge andextending downward, the lower ends of the said pockets tapering out andgradually merging into the full exterior diameter of the said section ofthe tube, and their upper ends opening into the bottom of the saidflange. The operation of forming such a tube as described above, is verysimple, the upper end of its lower section being contracted and groovedin a suitable die, after which the short upper section is applied, andit does not matter if the joint between the two sections is not tight,for any oil that escaped through the joint would be discharged into thefount of the lamp. By constructing the tube in this manner, I not onlyavoid the expense of soldering an independently made catch-flange intothe tube, which is a difficult operation, but I also avoid leakage fromdefective soldering. The advantages derived from the use of exteriorpockets for receiving and disposing of oil caught by the ilange, havebeen set forth in my other application, and will not be recited atlength here, more than to say that the oil intercepted by the flange isat once emptied into the pocket or pocketsin which it is retained untildisposed of by absorption by the wick, or by running back into the bodyof oil in the fount.

The air-distributer F, may be of any approved construction, so long asit is adapted to beset within the upper end of the sectional tube 1nwhich it may be supported in any desired manner, as, for instance, byforming in wardly pro ecting' bumps 0, within the upper section B. Thelower end of the airdistributer should be enough smaller in diameterthan the internal diameter of the sectional tube, to forma narrowannular space f, between the distributer and tube for the oil to flowthrough on its way to the inside trough.

I am aware that a two-part draft-tube is old, and I do not, therefore,claim that feature broadly, nor do I broadly claim herein'an oilpocketfor med in the exterior surface of the said catch-flange into which theupper end of each pocket opens, the flange being formed integral withthe lower section of the tube and in such a manner that it will not leakinto the inside of the same, all substantially as de-' scribed.

In testimony whereof I have signed this specification in-the presenceoftwosubscribing witnesses.

WILLIAM ,0. HUMAN.

Witnesses:

ALFRED DUNLOP, W. L. BABCOCK.

